class MessageConstant {
    /**
     * 消息-结束线程
    */
    static MSG_TERMINATE = "message_terminate"
    /**
    * 消息-任务开始
    */
    static MSG_START = "message_start"
    /**
     * 消息-任务已完成
    */
    static MSG_FINISHED = "message_finished"
}
module.exports = {
    MessageConstant: MessageConstant,
}